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Difference between IOC and Dependency Injection in Spring.
Inversion of control is a design principle which helps to invert the control of object creation.
According to the paper written by Martin Fowler , inversion of control is the principle where the control flow of a program is inverted: instead of the programmer controlling the flow of a program, the external sources (framework, services, other components) take control of it. It's like we plug something into something else. He mentioned an example about EJB 2.0.
Dependency Injection is a design pattern which implements IOC principle. DI provides objects that an object needs. Let’s say, class X is dependent on Y. So rather than creating object of Y within the class “X”, we can inject the dependencies via a constructor or setter injection.
| Sr. No. | Key | IOC | Dependency Injection |
|---|---|---|---|
| 1 |
Design Principle |
It is design principle where the control flow of the program is inverted |
It is one of the subtypes of the IOC principle |
| 2 |
Implementation |
It is a term which is implemented by multiple design patterns service locator , events , delegates and dependency Injection |
DI is design pattern which can be achieved by constructor and setter injection |
| 3 |
Use Case |
Aspect oriented programing is one way to implement IOC |
In Case of change in business requirement no code change required |
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